Counterbalanced oven-door.



J. JUNGERS.

COUNTERBALANCED OVEN DOOR.

APPLICATION FILED OCT. 20. 1913.

m WJWM. Patented June 20, 1916.

2 SHEETSSHEET l.

'Illllllliiiilill:

J. JUNGERS.

COUNTERBALANCED OVEN DOOR.

APPLICATION FILED OCT. 20, I913.

1,1873%, Patented June 20,1916.

2 SHEETS-SHEET 2.

JOHN JUNGERS, OF GRAFTON, YVISCON'SIN.

COUNTERBALANCED OVEN-DOOR.

mamas.

Specification of Letters Patent.

Patented June 20, 1913.

Application filed October 20, 1913. Serial No. 796,123.

To all whom it may concern Be it known that 1, JOHN Junenns, a citizenof the United States, and resident of Grafton, in the county of Ozaukeeand State of Wisconsin, have invented new and useful Improvements inCounterbalanced Oven- Doors, of which the following is a descripti on,reference being had to the accompanying drawings, which are a part ofthis specification.

This invention has for its object to provide a downwardly swinging ovendoor for ranges or the like which will be counterbalanced in allpositions thereof so as to make the opening and closing of the dooreasily accomplished and so as to avoid the slamming of the door and itsinjurious effects upon the contents of the oven when baking is inprogress.

Another object of the invention is to provide a counterbalance for ovendoors to 00- cupy the space between the oven and the fire box.

With the above and other objects in view the invention consists in. thecounterbalanced oven door as herein claimed and all equivalents.

Referring to the accompanying drawings in which like characters ofreference indicate the same, parts in different views; Figure 1 is asectional. ele 'ation of a range equipped with the counterbalanced ovendoor in accordance with this invention, the oven door being shown infull lines in its closed position and in dotted lines in its openposition; Fig. 2 is a. similar view showing the oven door in anintermediate position, a portion of the weight shifting link beingbroken away to show its bearing surface for the weight arm; Fig. 3 is asectional plan view of the parts on the plane of line 33 of Fig. 2; and,Fig. 4c is a sectional rear elevation on the plane M of Fig. 1.

In these drawings 10 indicates a range of ordinary construction and 11is the oven door thereof which has trunnions 12 at its lower edge onwhich it is pivotally mounted to swing downwardly to its open positionas shown in Fig. 2 and by dotted lines in Fig. 1. One of the trunnions12 is squared at its end to fit in a correspondingly shaped opening ofan arm 13 which projects through an opening in the front of the rangeinto the space 1 1- between the oven 15 and the fire box 16. Any otherdesirable form of connection may be provided for the arm 13 to make itrigid with the oven door and a cap or covering 17 is desirably securedto the front of the range to inclose this connection and form thebearing for the trunnion 12. In the closed or upper position of the ovendoor 11 the arm 13 extends downwardly as shown in Fig. 1. At its innerend the arm 13 may be made forked, as seen in Fig. 3, and it ispivotally connected to a weight shifting link 18 which carries a head 19having an oblique slotted projection 20 through which a pivot bolt 21passes, such pivot bolt being carried by an arm 22 which is pivotallymounted at 23 in the upper front corner of the space 1 1 and carries aweight 24; at its lower end. Besides the oblique slotted projection 20the head 19 has a curved bearing surface 25 to come into engagement withthe lower edge of the weight arm 22 when the oven door is in anintermediate position and remains in engagement therewith throughout thelower portion of the travel of the oven door. This bearing surface 25stands at such an angle with relation to the other portion of the link18 that the point of contact between it and the weight arm 22 isconstantly shifted during the lower portion of the movements of the ovendoor such point of contact moving nearer to the pivotal connection 23 ofthe weight arm as the oven door approaches its lowermost position andreceding from the pivotal connection 23 as the oven door rises from itslower position thus varying the leverage and causing the weight tobecome more effective'in counterbalancing the oven door. The weightnaturally becomes more effective for counterbalancing the oven door asthe weight arm approaches the horizontal but this shifting of the linkbearing on the weight arm due to the bearing surface 25 rocking on theweight arm so as to bring the point of contact nearer to the pivotalconnection of the weight arm increases such tendency. This tendency isfurther increased by reason of the curvature of the bearing surface 25being such that its point of contact with the weight arm isprogressively farther from the pivotal connection between the link 18and the arm 13 as the oven door approaches its open position, thushaving the effect of increasing the length of the link connection. Thevarying leverage is further affected by the slotted oblique projection20, for the pivot bolt 21 slides through the slot thereof during themovement of the oven doorwhile the weightarm 22 is resting on' thebearing surface 25 and the direction of the slot is such as to force thebearingsurface 25 to slide on the weight ing surface is provided with aside cheek is shown in Fig. 1.

arm as well as rock thereon, thus further reducing the distance from thepivotal con- 26 which is broken away in Fig. 2 but which By means of.this invention the oven door in swinging from its/vertical position toits hor zontal position s opposed by an increasing resistance duetotheweight arm increasing its-effectiveness by rmoving toward a horizontalposition and also due to.

the variation in the leverage caused by the shifting ofthe bearing pointbetween the link and the weight arm approaching the V pivotal connectionof the weightarm and also i the increasing effective length of the link18,v

thechange inbearing point being produced by the rocking of, the link onthe weight 1 arm .as' well as by the cam action of the inclinedslot onthe pivot bolt 21 causing the bearingsurface of the link to slide on theweight arm.

It is foundin practice that in this mannfir; the' oven door may be soperfectly "counterbalanced that itmay'sta-nd at rest in anyincli'nedposition thereof so that it is very easily moved but will not slameither in opening or closing. By locating the counterbalancing systemwithin the space I between the fire box and the oven it is con operationof the range and without'the necealed. without interfering with thenormal cessity for increasing the size of the range.

VVhat I claim as new [and desire to se-,

cure by Letters Patent is:

1. In an oven door or the like swinging on a horizontal axis,acounterbalancing means therefor, comprising an arm having con nectionwith the door, a swinging weight arm, and a link connected with thefirstmentlOIiGCl arm and havinga curved bearing surface engaging the weght arm with the point 7 of engagement therewith approaching the pivotalconnectionlof the weight arm as the door approaches its horizontalposition, said bearing surface bemg eccentric with rela- -tion to thepivotal connection between the link "and thedoor arm with the portion ofV the bearing surface nearest the pivotal con- V the door approaches itshorizontal position,

nection in engagement. with the weight arm in the closed position 'oftheoven door. to;

increase the effective length of the link as like 0 tumm be obtained form cent each,

2. In an oven door or the like swinging on a horizontal axis, a.counterbalancing means therefor, comprising an arm having weight armengaging the slotted projection for causing the bearing surface of thelink to slide on the weight arm toward the pivotal connection of theweight arm as the door approaches its horizontal. position.

3. In an oven door or the like swinging on a horizontal axis, acounterbalancing means therefor, comprising an arm having connectionwith the door, a swinging weight arm, a link pivotally connected withthe first mentioned arm and having a curved bearing surface eccentric tothe pivotal connection be tween the link and. the bearing arm, a slottedprojection on the link, a bolt on the weight arm passing through theslotted projection for pivotally connecting the link with the weight armand causing the weight arm to swingwhen the door begins its movementfrom a vertical position toward a horizontal position, said bearingsurface adapted to engage the weight arm and cause the bolt to slidethrough the slot of the link to force the bearing surface to slide onthe weight arm toward the pivotal connection of the weight arm.

4. In an oven door or the like swinging on a horizontal axis, acounterbalancing means therefor, comprising an arm having connectionwith the door, a swinging weight arm, a link pivotally connected withthe first mentioned arm and having a bearing surface for engaging theweight arm, and means for causing the bearing surface of the link toslide on the weight arm toward the pivotal connection of the weight'arlnas the door approaches its horizontal position.

5. In an oven door or the like swinging on a horizontal axis, acounterbalancing means therefor, comprising an arm having connectionwith the door, a swinging weight arm, a link pivotally connected withthe first mentioned arm and having a curved bearing surface for rockingengagement with the weight arm, and means for causing the bearingsurface of the link to rock and slide on the weight arm toward thepivotal connection of the weight arm as the door approaches itshorizontal position.

In testimony whereof, I afiix my signa ture, in presence of twowitnesses.

JOHN JUN GEES. Witnesses RoB'r. P ZAUN,

W. lVEBnR, Jr.

by addressing the Gommlsnloner of Patents,

Washington, D. 0."

